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This is driving me crazy. When I try to view the video embedded into the page, I get the following error in firefox “Video format or MIME type is not supported”.
I am on IIS, and I do have the correct MIME type for MP4. Is there anything else I could check?
The issue ended up coming from our CMS.
The MP4 file was being loaded though a script, and that script’s name contained “-“, which the CMS decided to replace with “.”. Simply opening up Firebug’s Net tab allowed me to fix the error in a matter of minutes.
Firefox does not support H264 anyway, so that MP4 file had to be loaded through Flash.